Grab succeeded, as you’d expect (6)
I believe the answer is:
snatch
'grab' is the definition.
(synonyms)
'succeeded as you'd expect' is the wordplay.
I cannot quite see how this works, but
'succeeded' could be 's' (genealogical abbreviation) and 's' is present in the answer.
The remaining letters 'natch' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for snatch that I've seen before include "Grab, seize eagerly" , "Style of weightlifting" , "fragment of tune" , "Filch" , "Weightlifting manoeuvre" .)